/**
 * Extend the basic ItemSheet with some very simple modifications
 * @extends {ItemSheet}
 */
export class SimpleItemSheet extends ItemSheet {

  /** @override */
	static get defaultOptions() {
	  return mergeObject(super.defaultOptions, {
			classes: ["worldbuilding", "sheet", "item"],
			template: "systems/worldbuilding/templates/item-sheet.html",
			width: 520,
			height: 480,
      tabs: [{navSelector: ".sheet-tabs", contentSelector: ".sheet-body", initial: "description"}]
		});
  }

  /* -------------------------------------------- */

  /** @override */
  getData() {
    const data = super.getData();
    data.dtypes = ["String", "Number", "Boolean"];
    for ( let attr of Object.values(data.data.attributes) ) {
      attr.isCheckbox = attr.dtype === "Boolean";
    }
    return data;
  }

  /* -------------------------------------------- */

  /** @override */
	activateListeners(html) {
    super.activateListeners(html);

    // Activate tabs
    let tabs = html.find('.tabs');
    let initial = this._sheetTab;
    new Tabs(tabs, {
      initial: initial,
      callback: clicked => this._sheetTab = clicked.data("tab")
    });

    // Everything below here is only needed if the sheet is editable
    if (!this.options.editable) return;

    // Add or Remove Attribute
    html.find(".attributes").on("click", ".attribute-control", this._onClickAttributeControl.bind(this));
  }

  /* -------------------------------------------- */

  /**
   * Listen for click events on an attribute control to modify the composition of attributes in the sheet
   * @param {MouseEvent} event    The originating left click event
   * @private
   */
  async _onClickAttributeControl(event) {
    event.preventDefault();
    const a = event.currentTarget;
    const action = a.dataset.action;
    const attrs = this.object.data.data.attributes;
    const form = this.form;

    // Add new attribute
    if ( action === "create" ) {
      const nk = Object.keys(attrs).length + 1;
      let newKey = document.createElement("div");
      newKey.innerHTML = `<input type="text" name="data.attributes.attr${nk}.key" value="attr${nk}"/>`;
      newKey = newKey.children[0];
      form.appendChild(newKey);
      await this._onSubmit(event);
    }

    // Remove existing attribute
    else if ( action === "delete" ) {
      const li = a.closest(".attribute");
      li.parentElement.removeChild(li);
      await this._onSubmit(event);
    }
  }

  /* -------------------------------------------- */

  /** @override */
  _updateObject(event, formData) {

    // Handle the free-form attributes list
    const formAttrs = expandObject(formData).data.attributes || {};
    const attributes = Object.values(formAttrs).reduce((obj, v) => {
      let k = v["key"].trim();
      if ( /[\s\.]/.test(k) )  return ui.notifications.error("Attribute keys may not contain spaces or periods");
      delete v["key"];
      obj[k] = v;
      return obj;
    }, {});
    
    // Remove attributes which are no longer used
    for ( let k of Object.keys(this.object.data.data.attributes) ) {
      if ( !attributes.hasOwnProperty(k) ) attributes[`-=${k}`] = null;
    }

    // Re-combine formData
    formData = Object.entries(formData).filter(e => !e[0].startsWith("data.attributes")).reduce((obj, e) => {
      obj[e[0]] = e[1];
      return obj;
    }, {_id: this.object._id, "data.attributes": attributes});

    // Update the Item
    return this.object.update(formData);
  }
}